SCALING BEHAVIOR OF GIANT MAGNETOTRANSPORT EFFECTS IN CO/CU SUPERLATTICES

We have observed two forms of scaling in magnetotransport properties of (111) Co/Cu superlattices: (1) the extraordinary Hall coefficient R(s) correlates with the resistivity rho(xx)(0) in the form R(s) is similar to rho(xx)2(0), and (2) the magnetothermopower S(H) correlates with the magnetoresistivity rho(xx)(H) in the form S(H)/T is similar to rho(xx)(0)/rho(xx)(H). The first effect relates to quantum mechanical side jump while the other relates to interfacial spin-dependent density of states (DOS). These results reveal the different roles of bulklike spin-dependent scattering in Co layers and spin-dependent DOS of interfacial layers in causing the observed large positive extraordinary Hall effect and giant longitudinal magnetotransport.